Significant Accounting Policies - Property, Plant, and Equipment (Details)		12 Months Ended
	Dec. 13, 2013	Jan. 31, 2019 USD ($)	Jan. 31, 2018 USD ($)	Jan. 31, 2015
Property, Plant and Equipment
Depreciation expense		$ 450,000	$ 774,000
Leases
Area under lease (sq. ft.)	24,335			10,350
Duration of rent allowance	8 months			2 months
Computer equipment and software | Minimum
Property, Plant and Equipment
Property, plant and equipment, useful life		3 years
Computer equipment and software | Maximum
Property, Plant and Equipment
Property, plant and equipment, useful life		4 years
Office equipment
Property, Plant and Equipment
Property, plant and equipment, useful life		5 years
Office furniture and fixtures
Property, Plant and Equipment
Property, plant and equipment, useful life		7 years